Use of instability curves for the assessment of post-liquefaction stability and deformation of sloping grounds

Bashar Ismael; Domenico Lombardi; Subhamoy Bhattacharya; Ahmad Syed M Syed

doi:10.1016/j.enggeo.2019.105347

Use of instability curves for the assessment of post-liquefaction stability and deformation of sloping grounds

Bashar Ismael, Domenico Lombardi, Subhamoy Bhattacharya, Ahmad Syed M Syed

University of Surrey

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Abstract

The paper presents a simpliﬁed approach to determine the post-cyclic de-2
formation of liqueﬁed sloping grounds. The approach uses instability curves3
derived from undrained multi-stage (cyclic+monotonic) triaxial tests. It is4
shown that the salient aspects of the post-liquefaction deformation can be5
expressed as a function of the state parameter ψ, deﬁned as the void ratio6
diﬀerence between the current state of the soil and its critical state at the7
same mean stress level, and amplitude of accumulated cyclic strain. As the8
proposed approach predicts deformations, rather than residual strength or9
factor of safety, the method can be used for the deﬁnition of the performance10
criteria following a performance-based design approach. The application of11
the proposed method is illustrated through a real case study.

Original language	English
Journal	Engineering Geology
Early online date	9 Nov 2019
DOIs	https://doi.org/10.1016/j.enggeo.2019.105347
Publication status	E-pub ahead of print - 9 Nov 2019

Keywords

slopes
post-liquefaction
Dilatancy
critical state
state parameter
performance-based design

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10.1016/j.enggeo.2019.105347

lombardi_19_withoutmarkingAccepted author manuscript, 2.14 MB

Cite this

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title = "Use of instability curves for the assessment of post-liquefaction stability and deformation of sloping grounds",

abstract = "The paper presents a simpliﬁed approach to determine the post-cyclic de-2 formation of liqueﬁed sloping grounds. The approach uses instability curves3 derived from undrained multi-stage (cyclic+monotonic) triaxial tests. It is4 shown that the salient aspects of the post-liquefaction deformation can be5 expressed as a function of the state parameter ψ, deﬁned as the void ratio6 diﬀerence between the current state of the soil and its critical state at the7 same mean stress level, and amplitude of accumulated cyclic strain. As the8 proposed approach predicts deformations, rather than residual strength or9 factor of safety, the method can be used for the deﬁnition of the performance10 criteria following a performance-based design approach. The application of11 the proposed method is illustrated through a real case study.",

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language = "English",

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T1 - Use of instability curves for the assessment of post-liquefaction stability and deformation of sloping grounds

AU - Ismael, Bashar

AU - Lombardi, Domenico

AU - Bhattacharya, Subhamoy

AU - Syed, Ahmad Syed M

PY - 2019/11/9

Y1 - 2019/11/9

N2 - The paper presents a simpliﬁed approach to determine the post-cyclic de-2 formation of liqueﬁed sloping grounds. The approach uses instability curves3 derived from undrained multi-stage (cyclic+monotonic) triaxial tests. It is4 shown that the salient aspects of the post-liquefaction deformation can be5 expressed as a function of the state parameter ψ, deﬁned as the void ratio6 diﬀerence between the current state of the soil and its critical state at the7 same mean stress level, and amplitude of accumulated cyclic strain. As the8 proposed approach predicts deformations, rather than residual strength or9 factor of safety, the method can be used for the deﬁnition of the performance10 criteria following a performance-based design approach. The application of11 the proposed method is illustrated through a real case study.

AB - The paper presents a simpliﬁed approach to determine the post-cyclic de-2 formation of liqueﬁed sloping grounds. The approach uses instability curves3 derived from undrained multi-stage (cyclic+monotonic) triaxial tests. It is4 shown that the salient aspects of the post-liquefaction deformation can be5 expressed as a function of the state parameter ψ, deﬁned as the void ratio6 diﬀerence between the current state of the soil and its critical state at the7 same mean stress level, and amplitude of accumulated cyclic strain. As the8 proposed approach predicts deformations, rather than residual strength or9 factor of safety, the method can be used for the deﬁnition of the performance10 criteria following a performance-based design approach. The application of11 the proposed method is illustrated through a real case study.

KW - slopes

KW - post-liquefaction

KW - Dilatancy

KW - critical state

KW - state parameter

KW - performance-based design

UR - https://www.scopus.com/pages/publications/85075293053

U2 - 10.1016/j.enggeo.2019.105347

DO - 10.1016/j.enggeo.2019.105347

M3 - Article

SN - 0013-7952

JO - Engineering Geology

JF - Engineering Geology

ER -

Use of instability curves for the assessment of post-liquefaction stability and deformation of sloping grounds

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